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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6e4db15a2a363c4d7fb9f666a37dc9e8717e369b171c9515e7f6e7011d906e64' 
  AND token = 'xX2cXIhmL36nMtqGYUpISS1OejdD4cQGmoaCBI15WOY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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