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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1d94c16cb425b0e3b82259903da8f87a19e300de9a80fc5db3a5047d83bc9a57' 
  AND token = 'iDpZl2ojvh4CQPR7KESVdgCTlrsTpm7R/gnfa0WbG1Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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