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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b325a1e058ab309d4af6bf41c40e7f2ac1d9d113d1088ce1e0fb2b20c5d5040b' 
  AND token = 'puIeCnVJWxsNMRScCBZ0nH4Dk1wWYHX8HHRV5t6nh+0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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