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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bbe0ce2e8cbcf35ada30284ebaf16eac8a1731f43ad6de3a0b423dbad4b389ba' 
  AND token = 'FnadP4A/jEOXfrqjGdYWyHKR8kDgotS2OBdxg1glHDE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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