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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd79cd9a09a976c15be051eab96506876c2fd7e20db35de68e6f6901cc11b3537' 
  AND token = 'hX7tsXQ1Y4cx3H0dyYX7isMHZRG05bNTDgYr+fOmxfc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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