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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dc4bc1adcf5712f15d2b2c6b0ac25e784cb1162d4dd6794228c372a3a3aa3366' 
  AND token = 'A/gr6Bu7SKEAukq78e+UxaCoTq9D4zkjm75zn125rAc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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