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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f5075ea99fda2095d9a715f5de6bdcb3f94a68c37abf5158a273fcf3a4743e02' 
  AND token = 'o3ahh+JW1IZeklFeOnU5QmLIGRdQZlrvbk9K+Ana7fA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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