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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5e03dd1120011973f9faa1ea2345e0265f79b2eccc893c7b1fbc2e3c265057be' 
  AND token = 'Zki//Pd7af2piG2m4m6MVaUJWdbZsRQ05mFeohC2iNo=' 
  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"
    }
  }
}