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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8b345fa19dd554a309eff25dba059f5198870b54199db43b70f828f89da94b44' 
  AND token = '9SNTna9dSw95svboP6MYWShcsE/FrjTJ0E77yEfHOCY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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