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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1ed4ed8f5c8a174a4b40a94f78b2d4de1d57d80fdab41dfdcaf4cc0aeeb59a4b' 
  AND token = '70MI7fqK/fi1p4JpuWRaumGUeChQ9EstLrgvZWKKulY=' 
  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"
    }
  }
}