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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e63baf63b7abce5b9fd720d2d4eb006927167ebba5d0933f2fbf8da6c8922e42' 
  AND token = 'raURk+99REWIW4N40aX2mkwqeeRHyo9Hl3om1r3T2VQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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