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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cd3b3d67fba251bfebfa6a235e334a376fb8ca95d9e3150dc31aa4a0e117b3e8' 
  AND token = '8QIa9BEKX9r1A4WCVW4NvWeLPIniIeryPFsoQ09OKuk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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