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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd25ed599fe3fb8be398c39a842cad80803111b9377fa7f85dc7ba809644b7de0' 
  AND token = 'BtohetVqbn352Qc4gxf8cJ2F3l23Qn/+aPkhztIjVHs=' 
  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"
    }
  }
}