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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e5cb5418ff2e0e6241cdafef2705f51fa8b3dd692b639774bd459af5025c187d' 
  AND token = 'tGpNbR/rzUn46UZGSdxw/U98x3HYbyjHafZyYHyvCwk=' 
  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"
    }
  }
}