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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b7713d021b2c274528d293101423883eb2d0f8a977d71b5fa3fb5dd9244d1935' 
  AND token = 'zzT8Lrbg4eiGNHIDP/L4C/N/3Z9p+W1JORM/7/Yn/H8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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