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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b09a5941ce63838c19ae9cd8e3e3853051f96f953e2bb667af9835f246d66d08' 
  AND token = 'S1y21R/X6T0+Dkza3Jt65zLfqBp6TczzuPBXB1IOoV0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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