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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1b0573caac60adc42d9f84045d9ae14aaacf6f7393ba200984efe89bc0f76a66' 
  AND token = '4Ylq02V2ETj75+Tmc4lm6uDV1Lbyqpi+rSKlCwOKIrw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "message": "Impossible WHERE noticed after reading const tables"
    }
  }
}