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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0d03f5903b2fcc520da2cf570cebd2e68c930fe35844c8858545015e8f6ddc70' 
  AND token = 'Ghm5i/8E+nX4rCYlKWP2aBq0G2QPRPtEyi8B8o/SDa8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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