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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '93d5631836921a14a1ef9c1180d64561fdd3a6c40222cd9ce7a98b0847940d14' 
  AND token = 'WqvY73AO6rflFtDqnlEtcaI7XPt125FM7Rce64dNYL0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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