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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd7fc3f3d1b68db8c7e9627204e1a80ab8d5935c0f0ded568b5e7ec45af76b7a4' 
  AND token = '4xW0ymZFi8qqkzdQEo7RmIKsX4qDfzTJKrGkxYvfaqk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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