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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '883b8d580e4e8b2de4437d80a87427ef78572cedf4cf94e80fc923667ce106ee' 
  AND token = 'hoFR6sLeNIVMJN/pN1MxizzgWsbKaPpSSW3/YSLEDR0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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