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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2c97ef451144efabf9fd2f03a305bc2e9cce831a22174a0c3a672da40de02aa9' 
  AND token = 'npkspu4jKdHXoEV50cZeyvm8qzPOuQnEsKxzPD++ug4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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