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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8c66b1c07f4b1fb37f0bf8495ad1b51b1272d49282f6b7fc13442d4de2b71000' 
  AND token = 'X9ZbC+iklcdrufi7LLXWBno8LXw+DbDWsRgh2cRgcrc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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