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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8eda5d450898c5d2cfec9feb36cd7ccde08d50b3314d6d3e66744f8653fc324b' 
  AND token = 'ijP270yPHOKNqks0d2Q6m+APrAvmA6lXN56HzYz7VmA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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