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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '01a0e165600bfadc593d1f6b2ee2a779e8add73e597852f7ac22ea1efeb8150a' 
  AND token = 'm0nE3LCyvZFBw3oQaYldW3TLcOOBH4ixrqkaOUB1sMg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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