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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0bb62c7ea88f8a5b7bd8b949d783d1bd536a67ae6f77ddd68cc8a3932eb6f6f7' 
  AND token = '8I6FPYIqI7tmzzoCuqGN4t4NiEjSDT2Pdkw1FPdnO5g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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