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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '51194d19df4fb4f9378ca4a9e78f58f2562e50b22af4b948162c8607d76aa370' 
  AND token = 'Di9sbwvgTBND+6RE8rTxkX94eCLCpWYIOLDRguC1VVo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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