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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2665d5e9b10a7dff4c2e3afca06b51d8b1ab45d5951926324624687cc0fd1fa9' 
  AND token = 't1a9X4rTtt4ml5ZUCz2paSmH2kgsVQley7xx1B72/xc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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