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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '274e605e9ef745e5c980bdc1b0578ef463f110e79413477802aac1fad916478e' 
  AND token = 'zKP7poJ6FQ5S5UAvUIUb11dVbZRQpMz1zq4GxqH5cCg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00055

JSON explain

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